Ubuntu :: BASH: Execute Next Command Until Another Command Succeed?

Mar 19, 2010

I have a big bash script ,its goal is to download movie one by one . But I often get into a problem: if this script is executed in cron,it often does not completely download the movie.I often find the movies it downloaded are several KB while the movie is actually 20MB.So I think it is because it did not wait for finishing one task ,and jump to download another.So I want to know ,is there a way to force the bash script to wait until one movie downloaded completely and then start to download another movie ?

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Software :: Way To Execute Bash As Interactive And Run A Command?

Jun 20, 2009

I'm trying to start bash with a command and have it interactive like this:bash -i -c "echo Welcome!"As in, execute the command and allow me to use it as an interactive shell afterwards. (I'm doing something more complicated than echoing, but this doesn't work.)I've tried this from a running gnome-terminal, from one gnome-terminal to a new one withgnome-terminal and from the Alt+F2 program launcher (with "Run in terminal" ticked).

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Programming :: Using Bash Command To Execute Output Of Awk?

Mar 24, 2011

I am trying to process a column separated data file, with a few bash command. For example, I have


file1 aaaa yes
file2 aaaa no
file3 bbbb yes

Let say I want to create new file with the output of first column and do something else with the output of 3rd column. Of course there are many ways to process this data file, but I wish to know by using awk, how could I do it. I'm trying:


awk '{system("touch $1")}' datafile

but the shell command will not able to get the awk '$1' output. How do I get this done ? And for another question, if the data file contains the variable name of a shell variable, how could I make use of it during a awk output ? For example I have a datafile1:


server1 yes
server2 no

And in another server declaration data file, I got this datafile2:



And in my awk script, I want to achieve something like (the syntax is definitely wrong, just to demonstrate what I assume it will like):


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SUSE :: Automate Execute Command, Reboot And Execute Command?

Dec 1, 2008

Is there a way to execute some command and then after the command completes utomatically reboot the system and then after the system reboots execute another command ? For example look at the sequence shown below(1) Execute command-1(2) After the command-1 in (1) is completed,reboot the system (3) Execute command-2(4) After execution of command-2 reboot the sytemIs there a way i can automate this process so that i need not reboot the system manually

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Programming :: Effect Of Using Eval To Execute A Command As Opposed To Writing It On The Command-line?

Jun 18, 2010

Code: cmd='date | wc'

$cmd If this script is executed, an error is generated. The reason written was that "The execution fails because the pipe is not expanded and is passed to date as an argument".What is meant by expansion of pipe. When we execute date | wc on the command line, it goes fine.then | is not treated as an argument. Why?

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General :: Only Execute 2nd Command On Successufl Execution Of 1st Command?

Aug 19, 2009

I have a script which builds a project and then runs junit tests. However, if the build fails, the junit tests fail with the same error message.Therefore the command which runs the junit tests should only be executed if the build was successful.

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Ubuntu :: Lpr Command- And Man -t (bash Command - Print Both Sides Of The Paper Using A Printer?

Mar 29, 2010

I just recently learned about the wonderful little lpr command- and using man -t (bash command) to beautifully print man pages for reference- but is there a way to print both sides of the paper using a printer so equipped?

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General :: Bash Command History Update Before Execution Of Command

Jun 7, 2010

Bash's command history is great, especially it is useful when adding the history -a command to the COMMAND_PROMPT.However, I'm wondering if there is a way to log the commands to a file as soon as the Return key is pressed, e.g. before starting the command and not on completion of the command (using the COMMAND_PROMPT option would save the command once the prompt is there again).

I read about auditing programs like snoopy and session recorder like script but I thought they're already too complex for the simple question I have. I guess that deactivating that script logs all the output of the command would lead already in the right direction but isn't there a quicker way to solve that probelm?

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General :: What Does This Cryptic Bash Command Mean - Why Command Crashes

Mar 20, 2011

Possible Duplicate: What does this cryptic bash command mean? Why this command crashes Linux? :(){ :|:& };:

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General :: Command To Delete Bash Command History?

May 31, 2010

What's the command to delete bash command history?

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Software :: Allow A Group/user To Execute A Command, Where One Of The Parameters Of The Command Is A Group As Well?

May 3, 2010

Is it possible to allow a group/user to execute a command, where one of the parameters of the command is a group as well? example that does not work as intended:

Cmnd_alias SU=/bin/su -l %group1 This example works sortof, it treats the "%group1" literally. I know I can list out the "/bin/su -l <eachuser>", but as you can imagine that is impractical. In this example, I want people in group2(not shown for brevity sake) to be able to su to someone in group1

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Programming :: Bash Ambiguous Redirect - Redirect One Command Output Which Will Be Treat As A Content Of File For Another Command?

Mar 9, 2011

I am trying to grep multiple numbers from file, grep does have the -f option for that.

Code: grep -f <`seq 500 520` /etc/passwd I know this could be done with

Code: for i in `seq 500 520`; do grep "$i" /etc/passwd; done But my question is fare more behind this example. It is possible to redirect one command output which will be treat as a content of file for another command ?

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Ubuntu :: Execute Command Without Login

Sep 14, 2010

I want to start my Ubuntu 10.04 and without logging in I need a command started. The command is setxkbmap .... So, I will not put the command in my .profile, nor in my .bashrc, because I am not going to login.

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Ubuntu :: Execute Command Without The Login?

Sep 14, 2010

I want to start my Ubuntu 10.04 and without logging in I need a command started. The command is setxkbmap .... So, I will not put the command in my .profile, nor in my .bashrc, because I am not going to login.

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General :: Command To Check The Java Version: Java -versionand Got :bash :java: Command Not Found?

Jul 26, 2010

I've just installed java (jre-6u21-linux-i586.bin) on Red Hat 4.4 AS and issued this command to check the java version: java -versionand got :bash :java: command not found

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Ubuntu :: Terminal Bash / -bash: Ls: Command Not Found

Jun 5, 2011

I got a problem with terminal, since i'm really a noob with terminal i don't know how to fix it.Everytime i type in a command it shows for example:

-bash: ls: command not found

Even the basic commands don't work... just cd <directory> and those things works

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General :: Write A Literal Bash Command In A Bash File?

Nov 29, 2010

I create a bash script that writes another bash file. But in the generated bash file I want to write a bash command in the file and not executing it.Here's my bash file:

cat > ~/generateGridmix2data.sh << END


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Ubuntu :: Automatically Execute Terminal Command?

May 13, 2010

I googled around and couldnt find what I was looking for. Maybe I used the wrong search terms, but whatever. I was wondering if there was a possibility to execute a series of terminal commands just by double-clicking an icon. For example, there would be an icon on my desktop, and if I were to doubleclick it, it would execute "cd ~/.wine2" and then "WINEPREFIX="$HOME/.wine2" wine program.exe".

I realise that most of you will probably go "duh, that's simple" or something similar, but I am extremely new to ubuntu, and dont know my way around yet.

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Ubuntu :: How To Execute Command Automatically After Login

Feb 2, 2011

I need to execute this command after login: gvfs-mount -d /dev/sda1.It works perfectly from terminal but it doesn't if I add it to "Startup Applications" or to rc.local.Is there another way?

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Ubuntu :: How To Execute Command At Boot Time

Apr 29, 2011

I use two monitors,my problem is that I want to change the setup,so that the other monitor becomes default.There's no problem with my BIOS settings and I have tried every GUI tool that could help me(to my knowledge).Well I've found this URL...that helps a lot but I want to execute the command every time I boot before the splash screen(so that the login screen appears on the right monitor).I've tried rc.local but had no success.Any ideas on how to execute the command at boot time?

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Ubuntu :: Execute System Command With Perl?

Jun 13, 2011

i want to execute system command with perlm but it gives me error.

command is wmic client. here it is

open (EP, "/home/user/Templates/domainpc.log");
while (<EP>) {


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General :: Command Path Is In PATH But Bash Does Not Find The Command

Jul 12, 2011

kernel, slackware 12.0
GNU bash 3.1.17


As you can see, /usr/local/bin is in the path. However, bash does not look for nasm in /usr/local/bin.

If I am root, things go well:


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Debian :: How To Run Execute Command In Terminal

May 4, 2010

i have one executable file (filename : "tet"). i can run this command in other linux os like: "fedora, cent os" using command "./tet", and it's working fine. but this command not working in debian. i don't know how to execute this file.

1. i have tried with 755 and 777 permission
2. i have tried "home/fullpath/tet"
3. i have tried "/tet"
4. i have tried "./home/fullpath/tet"

but above all commands are failed. to run this execute file

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OpenSUSE :: Can't Execute Some Command With Sudo?

Nov 29, 2010

I would like to have an user that can execute al command with sudo.I configured sudo with yast2 and in the sudoers file actually there is a line with:USER ALL = (ALL) ALLWhere user is my username.But I can't use some command like ifconfig becouse it say that it can't find the command. I think that this is becouse of path, but shouldn't i get root path using sudo?

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General :: Execute A Command Whenever A File Changes?

Aug 27, 2010

I want a quick and simple way to execute a command whenever a file changes. I want something very simple, something I will leave running on a terminal and close it whenever I'm finished working with that file. Currently, I'm using this: while read; do ./myfile.py ; done And then I need to go to that terminal and press Enter, whenever I save that file on my editor. What I want is something like this: while sleep_until_file_has_changed myfile.py ; do ./myfile.py ; done

Or any other solution as easy as that. BTW: I'm using Vim, and I know I can add an autocommand to run something on BufWrite, but this is not the kind of solution I want now. Update: I want something simple, discardable if possible. What's more, I want something to run in a terminal because I want to see the program output (I want to see error messages).

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General :: Execute Ssh Command Without Password?

Oct 3, 2010

How do I set up SSH so I don't have to type my password? i execute the following command ssh -l admin hostname command but each time i execute it, it ask me to enter password.how i can give it password as default because i'm going to put in bash file ?

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General :: Execute A Command After Sudo?

May 4, 2011

I am working in a CentOS environment with numerous CentOS machines. Currently there are multiple developers that each have their own login/home directory and then for various admin tasks we all share a single super user account.

The problem

I have a number of aliases, variables, functions, and settings that exist in my personal login's .bash_profile. None of these are available in the shared super user's .bash_profile. My current work around is that everytime I sudo in as the super user and I re-execute my .bash_profile from my personal user's home directory. I am not allowed to edit the init stuff for the super user

The Question

Is there any way I can automate my sudo sequence such that it will execute my personal .bash_profile after I've executed sudo without requiring me to edit the super user's bash init stuff?

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Networking :: Execute Command From Guest OS?

Dec 25, 2010

I have linux as my host OS and windows as my guest OS on vmware. is there any possible way to execute linux commands from windows the guest OS? for example create new files, view files, ssh, check processes running... etc.

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General :: Execute A Command In A Link?

Jun 30, 2011

When i click in one icon (for example), this icon executes "java -jar ...". In another words: Make a .exe on linux.

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General :: Unable To Execute Top And PS Command

Jul 29, 2010

Top: error while loading shared libraries: libproc.so.2.0.6: cannot open shared object. I am not able to execute top and ps command.

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